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Support Center > State Tax Registration > Connecticut
You need two separate Tax Identification Numbers in the state of Connecticut:
  • State Income Withholding Tax
  • State Unemployment Insurance Tax
You can register online at the CT Department of Revenue (DOR) website. Contact the agency directly at 1-860-297-5962 for registration assistance or to check if a tax identification number is already assigned for your business.

Generally, this Tax ID is a number ending in -000.
You can register online at the CT Department of Labor (DOL) website. Contact the agency directly at 1-860-263-6550 for registration assistance or to check if a tax identification number is already assigned for your business.

This Tax ID is a 7-digit number formatted as XX-XXX-XX.
You only need to know one tax rate assigned for the current year:
  • State Unemployment Contribution Rate
Your contribution rate will be assigned when you register and will be updated on an annual basis from the Department of Labor. Contact the agency directly at 1-860-263-6550 to verify your current rate.
Send any tax identification number or tax rate updates to your Account Executive or email [email protected].
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